unisonic technologies co., ltd 278rxx linear integrated circuit 4 terminal 2a output low drop voltage regulator ? description the utc 278rxx series are low drop voltage regulator suitable for various electronic equipments. it provides constant voltage power source with to-220f-4 terminal lead full molded pkg. the regulator has multi function such as over current protection, overheat protection and on/off control. ? features * 2.0a output low drop voltage regulator. * built in on/off control terminal. * built in over current protecti on, over heat protection function. to-220f-4 1 ? ordering information ordering number lead free halogen free package packing 278rxxl-tf4-t 278rxxg-tf4-t to-220f-4 tube note: xx: output voltage, refer to marking information. www.unisonic.com.tw 1 of 8 copyright ? 2013 unisonic technologies co., ltd qw-r102-048.b
278rxx linear integrated circuit ? marking information package voltage code marking to-220f-4 05: 5.0v 12: 12v 33: 3.3v ? pin configuration ? pin description pin no. pin name description 1 v in input dc supply voltage 2 v out output voltage pin 3 gnd ground pin for the ic 4 control on/off control pin unisonic technologies co., ltd 2 of 8 www.unisonic.com.tw qw-r102-048.b
278rxx linear integrated circuit ? block diagram unisonic technologies co., ltd 3 of 8 www.unisonic.com.tw qw-r102-048.b
278rxx linear integrated circuit unisonic technologies co., ltd 4 of 8 www.unisonic.com.tw qw-r102-048.b ? absolute maximum rating (t a =25c, unless otherwise specified) parameter symbol ratings unit remark input voltage v in 35 v on/off control voltage v c 35 v output current i o 2 a power dissipation 1 p d1 1.5 w no heatsink power dissipation 2 p d2 15 w with heatsink junction temperature t j 125 c operating temperature t opr -20~80 c storage temperature t stg -30~125 c soldering temperature (10sec) t sol 260 c note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? electrical characteristics (t a =25c, i o =1.0a, unless otherwise specified) for 278r05 (v in =7v) parameter symbol test conditions min typ max unit output voltage v o 4.88 5.0 5.12 v load regulation reg load i o =5ma~2a 0.1 2.0 % line regulation reg line v in =6~12v 0.5 2.5 % temperature coefficient of output voltage t c v o t j =0~125c 0.02 0.05 %/c ripple rejection r r 45 55 db drop out voltage (note) v d i o =2a 0.5 v output on state for control voltage v c(on) 2.0 v output on state for control current i c(on) v c =2.7v 20 a output off state fo r control voltage v c(off) 0.8 v output off state fo r control current i c(off) v c =0.4v -0.4 ma quiescent current i q i o =0 10 ma for 278r12 (v in =18v) parameter symbol test conditions min typ max unit output voltage v o 11.70 12.0 12.30 v load regulation reg load i o =5ma~2a 0.1 2.0 % line regulation reg line v in =13~29v 0.5 2.5 % temperature coefficient of output voltage t c v o t j =0~125c 0.02 0.05 %/c ripple rejection r r 45 55 db drop out voltage (note) v d i o =2a 0.5 v output on state for control voltage v c(on) 2.0 v output on state for control current i c(on) v c =2.7v 20 a output off state fo r control voltage v c(off) 0.8 v output off state fo r control current i c(off) v c =0.4v -0.4 ma quiescent current i q i o =0 10 ma
278rxx linear integrated circuit unisonic technologies co., ltd 5 of 8 www.unisonic.com.tw qw-r102-048.b ? electrical characteristics (cont.) for 278r33 (v in =5v) parameter symbol test conditions min typ max unit output voltage v o 3.201 3.3 3.399 v load regulation reg load i o =5ma~2a 0.1 2.0 % line regulation reg line v in =6~12v 0.5 2.5 % temperature coefficient of output voltage t c v o t j =0~125c 0.02 0.05 %/c ripple rejection r r 45 55 db drop out voltage (note) v d i o =2a 0.5 v output on state for control voltage v c(on) 2.0 v output on state for control current i c(on) v c =2.7v 20 a output off state fo r control voltage v c(off) 0.8 v output off state fo r control current i c(off) v c =0.4v -0.4 ma quiescent current i q i o =0 10 ma note: input voltage shall be the value when output volt age is 95% in comparison with the initial value.
278rxx linear integrated circuit ? test circuit unisonic technologies co., ltd 6 of 8 www.unisonic.com.tw qw-r102-048.b
278rxx linear integrated circuit ? typical application circuit unisonic technologies co., ltd 7 of 8 www.unisonic.com.tw qw-r102-048.b
278rxx linear integrated circuit ? typical characteristics time (2ms/div) 01 02 0 dynamic load response 0 ch1=v in ch2=v out ch1: 2v/div) ch2: 20mv ch3: 2.5a/div v in =5v, i o =5ma~2a, ton=10ms, toff=10ms time (2ms/div) 01 0 dynamic load response 2 0 0 ch3=i o v in =5v, i o =5ma~3a, ton=10ms, toff=10ms ch1=v in ch2=v out ch3=i o 0 ch1: 2v/div) ch2: 20mv ch3: 2.5a/div 0 time (1ms/div) 051 0 0 power supply rejection 0 ch1=v in ch2=v out ch1: 500mv/div ch2: 10mv/div v in =5v, vip=0.5v(rms), f=1khz time (1ms/div) 05 1 0 power supply rejection ch1=v in ch2=v out v in =5v, vip=0.5v(rms), f=1khz 0 0 ch1: 500mv/div ch2: 10mv/div utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. unisonic technologies co., ltd 8 of 8 www.unisonic.com.tw qw-r102-048.b
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